Mix 1 cup sugar and 3 T. corn starch.
Then add 1 C. cold water over mixture wisk, and bring to a boil.
Remove from heat and add 3 T. of flavored gelatin (strawberry etc.) Stir until disolved. Add 1 T. butter and fold in fruit and 1 tsp. vanilla and a dash of salt.
This is great for Pie filling, Angel Food Cake topping etc.